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Title: Superallowed decays within and beyond the standard model

Journal Article · · European Physical Journal. A, Hadrons and Nuclei (Online)
 [1];  [2];  [3];  [4]
  1. Université Paris-Saclay, Orsay (France)
  2. Universitat de València-CSIC (Spain)
  3. Michigan State University, East Lansing, MI (United States); Université de Caen Normandie (France)
  4. KU Leuven (Belgium)

This note reviews the role of superallowed transitions in determining the strength of the weak interaction among the lightest quarks and in searching for new physics beyond the standard electroweak model. The two sets of superallowed decays in nuclei considered here are pure Fermi and mirror transitions. The first have been scrutinized for more than 50 years. Here, the most relevant results are presented and the role of the nucleus-dependent radiative correction and nucleus-independent inner radiative correction are reviewed. In this context, the systematic study of mirror transitions started about 15 years ago. Despite the significant progress made since then, the data is still limited by experimental uncertainties. Combining the results from all superallowed transitions, which are fully consistent, provides a test of unitarity of the first row of the Cabibbo-Kobayashi-Maskawa matrix, which displays a 2σ tension with the standard model.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Agence Nationale de la Recherche; Marie Skłodowska-Curie
Grant/Contract Number:
SC0000661; PHY-21-11185; ANR-20-CE31-0007-01; 860881-HIDDeN
OSTI ID:
1975532
Journal Information:
European Physical Journal. A, Hadrons and Nuclei (Online), Vol. 59, Issue 5; ISSN 1434-601X
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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